Sewing machine



G. SAUER SEWING MACHINE June 16, 1942.

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G. SAUER SEWING MACHINE June 16, 1942.

8 Sheets-Sheet 5 Filed Feb. 6, 1940 INVENTOR; George ,Sau/er] BY A ATTORNE s.

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Z/ WJTNESVS l M my@ 8 Sheets-Sheet 4 G. SAUER SEWING MACHINE Filed Feb. 6,* 1940 June i6, 1942.

INVENTOR;

' ,George Sauer, BY M y ATTORNEY G. SAUER SEWING MACHINE June 16, 1942.

v 8 Sheets-Sheet 5 Filed Feb. 6, 1940 nvr/ElvvroR.I 6em/ge ,Sm/zer] ATTORNEYS.

. 1 Y NNNGNLN June 16, 1942. G. sAUl-:R 2,286,441

SEWING MACHNE I Filed Feb. 6, 1940 8 Sheets-Sheet 6 June 16, 1942. G. SAUER SEWING MACHINE Filed Feb.` e, 1940 8 Sheets-Shea?I '7 W NL mgm mm@ June 16, 1942. G. sAuER SEWING MACHINE Filed Feb. 6,'1940 '8 Sheets-Sheet 8 INVENToR.- *Geoff/ ,Sa/wer,

ATTORNEYS.

Patented June 16, A1942 SEWING MACHINE George Sauer, Berwyn, lll., assigner to Union Special Machine Company, Chicago, Ill., a corporation of Illinois Application February 6, 1940, Serial No. 317,517

25 Claims. (Cl. Ilz-256) This invention relates to sewing machines, and has reference more especially to chain stitch sewing machines of the at bed type. In suchmachines the bed is usually of open construction throughout, and various movingparts, for example, of the feed, the looper and the drive mechanisms except for being shielded from above by the work support at the top of the' bed or base, are exposed andmust be lubricated either by application of oil directly to them individually, or by way of oiling holes in the work.

support. Although enclosed within the end /of Athe usual overhanging arm of the machine frame, the parts of the needle operating mechanism of such machines, as ordinarily constructed, must also be individuallyilubricated either by application of oil directly to them (upon removal of one or more cover plates) or by way of oiling holes in said arm. Dueto'the great number of parts which require lubrication, oiling under these circumstances is a tedious and time consuming task, and on this account is either neglected altogether or carelessly done bythe operators of the machines; and when done is invariably attended by oil flooding and spillage with resultant soiling ofthe work afterwards stitched in the machines.

My invention has for its chief aim to overcome the above drawbacks. This objective I attain, as hereinafter more fully set forth, by enclosing the parts of the looper, feed and drive mechanisms, insofar as is possible, within chambers formed in the machine bed or base; by provding means which takes oil from a' supply in the base and disperses it in such a way that part of it falls directly on some of the enclosed moving parts; by providing an auxiliaryreservoir by which part of the dispersed oil is trapped and conducted through channelling'and ducts in the walls and partitions of the base to a'll the other enclosed moving parts; and by vproviding in addition; wick filled ducts which deliver oil from within the base through its walls to the moving parts exteriorly of said chambers.

Another object of my invention is to provide for automatic lubrication y.of the needle operating mechanism which is accomplished, as also hereinafter more fully set forth, by dspersing oil within the needle head from a supply maintained in a well at the base .of the latter.

I furthermore make provisions within thehead to prevent excess oilfrom reaching the guide Abearings through which the needle and presser bars extend at the bottom of the needle head, and also to preclude escape of oil through the clearance openings in the sides of the head through which moving parts extend to the exterior.

In addition, provisions are made within hollows or chambers of the machine frame in accordance with, my invention for the accommodation and protection of the needle and looper thread tensions, as well as for the guidance of the threads with assurance against contamination with oil.

In connection with a sewing machine characterized as Vabove and embodying puller rollers to assist in feeding, it is a further aim of my nvention to provide for the accommodation of the puller roller actuating mechanism within the base so that it may be automatically lubricated with oil taken from the same source )which is used for the looper and feed mechanisms.

Other objects and attendant advantages of my invention will appear from the following detail description of the attached drawings wherein- Y' Fig. .I is .a vertical longitudinal sectional View of Aa sewing machine conveniently embodying the .25 present improvements.

Fig.II shows the machine in top plan with a retractable top cover of the hollow needle arm removed to expose the parts within said arm.

Fig. III is a view partly in elevation and partly in section taken as indicated by the angled arrows III-III in Fig. I, with the end cover of the needle head removed, with one of the oil shields within the needle head broken away to expose the parts of the needle operating mechaas msm which nes behind it.

Fig. -IV is a view corresponding to Fig. vIII with the oil shields intact.

Fig. V is a horizontal sectional view oi' the machine at a level below the top of the-baseA 40 taken as indicated by the angled arrows V-V Y in Fig. I.

Fig. VI is a horizontal sectional view at a higher plane taken as indicated by the angled arrowsVI-VI in Fig. I.

'45 Fig. VII shows the machine in bottom plan with the base bottom removed.

Fig. VIII is a transverse sectional view of the machine taken as indicated by the angled arrows VIII-VIII in Figs, I and V.A

Fig. IX is a transverse sectional view taken as XI-XI in Figs. V and VII.

`Fig. XII is a fragmentary detail section taken as indicated by the angled arrows XII--XII in indicated by the angled arrows XVI-XVI in Fig. XV.

Fig. XVII is a perspective view of a screw bolt by which a top cover plate for the base of th machine is secured in place.

Figs. XVIII and XIX are perspective Views of guards which shield certain parts of the needle operating mechanism from the splash of lubricant in the'needle head.

Fig. XX is a cross sectional view of the needle arm machine taken as indicated by the angled arrows XX-XX in Fig. I. Y

Fig; XXI is a view corresponding to Fig. I showing a modified form of my improved sewing machine with puller means.

Fig. XXII is a view corresponding to Fig. II showing the top plan of the modifiedmachine.

Fig. XXIII is a horizontal section of the modied machine taken as indicated bythe angled arrows XXIII-XXIII in Fig. XXI.

Fig. XXIV is a transverse sectional view of the modified machine taken' as indicated by the angled arrows XXIV-XXIV in Figs. XXI and XXIII.

Fig. XXV is across sectional view of the modified machine taken as indicated by the angled arrows XXV-XXV in Figs. XXI and XXIII; and

Fig. XXVI is an end elevation looking toward the ,right hand end of the machine in Fig. XXI with a portion of the frame broken out and in section.

Referring rst more particularly to Figs. I-XX, the frame of my improved sewing machine has a hollow base I with a top wall 2 which constitutes the work support, front and rear side walls 3 and 4, and end walls 5 and 6. A partition extends part way crosswise of the base as at 1 (Fig. V) from the rear wall 4, then. longitudinally for a distance as at 8, then again transversely as at 9 to meet the front wall 3. This partition moreover, is depressed as at I0, and at the bottom merges with a horizontal partition II which extends leftward in Fig. I to meet the end wall 5. The hollow of the base I is closed at the bottom by a removable cover plate I2, with incidental provision of a shallow interspace at I3 below the horizontal partition II or bottom of the chamber I5. As a consequence of this construction, the base is subdivided into two compartments I4, I5 whereof the first extends beneath the second at I3, and lwhereof a laterally-offset portion of the second extends horizontally over the first as at I0. The lateral offset portion I0 of the 'chamber I5 is accessible through an opening I6 in the top wall 2 of the base upon withdrawal of a cover plate shown at I1. The chamber I5 is, moreover, .open at the front as a consequence of the omission ofa por,

tion of the' side wall 3 at I8, (Figs. III and XI) but closed at the back by a removable cover plate I9 which extends crosswise of a Similar omission at the rear wall 4 at 20 (Figs. III and V).

VAs shown in Figs. I, X and XI, the top cover plate I1 fits into a perimetric depression 2| around the opening I6 so as to be flush with the upper face of the top wall 2 of the base and thus provide a continuous surface over which the work is progressed during the sewing. The left hand end of the cover plate I1 (Figs. I and VI) abuts against the contiguous edge of a throat plate 22 which also fits the recess 2l as shown, and a spring clip 23 attached to the bottom of the cover plate at the left hand end in Fig. I underreaches the contiguous edge of said throat plate to assist in retaining lsaid cover plate in position. The cover plate I1 is, however, secured againstv accidental displacement by a screw lbolt 24 which is illustrated in perspective in Fig. XVII. As shown, this screw bolt 24 has a smoothly rounded oblong head 25 which seatsA within an annular recess 26 in said plate, sec Figs. XV and XVI, and the threaded shank of which extends down through a diametrical slot 21 within the confines of said recess and engages in a boss 28 on the depressed portion I0 'of the cross partition. The width of the slot 21 corresponds with that of the bolt head 25 so that by a quarter rotation of the bolt, said head will be cleared to permit upward withdrawal of the cover plate I1. Qn its under side, the head 25 has cam slopes 29 'which coact with the side edges of the slot 21 in the plate I1 as said head is turned crosswise of said slot to secure the plate.

The left hand end of the opening I6 in the top wall 2 of the base is closed by a supplemental plate 30 which abuts the throat plate 22 within the recess 2|.

Integrally formed with the base I and risingtherefrom at, one end, is a trunk or standard 3| which is hollow and which at the bottom communicates directly into the hollow of the base. In turn, integrally formed with the standard is a hollow horizontal arm 32 which overreaches the base I, and which, at its free end, terminates ina hollow head 33 having a removable cover 35. A central chamber 36'is set apart within the hollow of the arm by a partition' 31 whichv 'serves as the back wall of the head and a partition 38 in upper continuation of the left hand side wall (Fig. I) of the standard 3|. lAs shown in Figs. I, II and XX, the central chamber 36 of the arm 32 has a cover 39 which is connected along the rear edge by hinges 4D, and which is engaged at its front edge by a spring catch 4I.

Guided for'up and down movement in bushings 42 and 43 at the top and bottom of the head 33, is a bar 45 which, at its lower end, carries a plurality of needles 46. The needle bar 45 is moved up and down endwise through a pitman 41 (Figs. I and III) from a counterbalanced crank memberv 48 at the left hand end (Fig. I) of a rotary shaft 49 which revolves in bearings 50 and 5I respectively set into the partitions 31 and 38.' The shaft 49 also has journal support' in a bearing 52 set into the right hand side wall of4 bar 56 is subject to the action of a leaf spring 58 which, as shown in Fig. I, is housed within the hollow of the arm 32. At its right hand end,

the spring 58 is apertured to engage a stud 59 at the top of a cross web 60 (Fig. I) within the arm 32. The left hand end of the spring 50 .extends through a clearance opening 6| in the partition 31 and is bifurcated as shown in Fig. III, to engage over the bottom iiangeof a thimble or stirrup like connection 02 at the top end of the presser bar 58 within the needle head 33. 'I'he pressure of the spring 58 is regulatable by means of a screw 63 which is -accessible upon retraction of the top cover 39 for the central chamber 36 of the arm 32, and which, at its lower end, threadedly engages into a boss 65 at the bottom of said arm. For the purpose of lifting the presser foot as is desirableto initially introduce the work beneath it, I have provided the machine with means including'a rock shaft 66 which is suitably journalled at its ends in the partitions 31 and 38 within the hollow of the arm 32 and which extends into the hollow of the head 33 where it carriesa finger -61 that underreaches a collar 68 on the presser bar 56. Afilxed to the shaft 66, within the central chamber 36 of the .arm 32 is a lever 69 which passes through a clearance opening 10 in the rear side of the arm 32 to the exterior for connection'by a chain or link to an actuating knee press or foot treadle,

' not illustrated.

Also located within the central chamber 36 of the arm 32 are tensions 1I for needle threads indicatedby the letter T, said tensions being Y mounted onl a plate 12 suitably sustained by one of the side walls of thearm and the cross web 60, and being releasabl by encounter of a wing 13 on the shaft 06 with the bottom endsof the stems 15 of the tensions. Thus when the shaft 66 is operated to lift the presser foot 55, the tension on the needle threads T is concurrently relieved. The needle threads T pass from suitable sources of supply (not illustrated) through individual guide eyes 16 (Figs. II and XX) in the rear of the arm 32 to the tensions 1| within the chamber 36, and from thence pass out through ber 48 on the shaft 66 within the head 33 and the needle bar and so prevents direct access of the splash oil onto the needle bar. Another shield 88 of angular configuration (Figs. I and XVIII) has its vertical portion 89 secured by screws 90 to the partition 31 within the head 33. The laterally extending bottom portion 9| of the shield 88 acts to further prevent an excess amount of the splash lubricant from reaching rthe moving parts of the needle operating mechanism contiguous to the needle and presser bars 45 and 55, and also prevents splash of oil through the opening 6| in the partition 31 by way of which the presser spring 58 enters the head 33. The bearing 50 for the shaft 49 is lubricated by oil entering it from the head 33 by way of a duct 92 in the partition 31. Interposed between the open end face of the needle head 33 and its cover 35 is a sheet'83 of transparent material' which acts as a sealing means. The sheet 93 also serves as a transparency cross a small window opening94 in the cover 35 through which the supply of the oil within the well 82 can be checked from time to time.

Extending longitudinally through the hollow of the base I is a rotary shaft 95, which, through a train of gears 96,' 91 and 98 within'the hollow of the standard 3 I, is driven from the upper shaft 49, the ratio and arrangement of these gears being such that the two shafts are caused to rotate in unison and in the same direction. As

v shown in Figs. I and V, the lower shaft 95 is jourindividual guide eyes 11 in the front of said arm to a xed guide 19 en route to a take-up 19 (Figs. II. III and IV). After leaving the take-up 19, the threads T run over a wire guide 80 at the front side of the needle head 33, and finally pass from thence to the needles 83. The take-up 19 is in the form of a finger, which, as shown, is connected to the needle bar within the hollow of the head 33, and which extends laterally 33 and thus automatically lubricate the parts of the needle operating and the presser bar operating means. It is to be particularly noted that the guide bushings 43 and 51 respectively for the needle bar-45 and the presser bar 55 extend coni siderably above the oil level in the well 82 to insure against direct leakage of the lubricant through them. Clampedto the upper end of theguide bushing 51 for 'the presser bar 56 within the head 33 is a shield element 85 which is illustrated in perspective in Fig. "0?, and which has a wing 86 with a sealing strip 61 engaging one of the side walls of said head. As shown in Fig. l, the wing 86 extends betweenthehcrank memnalled in bushings 99 and |00 respectively in the end wall 5 and in the cross partition 1, and it also has journal support in a bearing |0| inthe end wall6. I y y Arranged to cooperate individually with the needles 45 within the chamber I5 of the base I, in stitch formation is a gang of loopers |02 which' receive 'their loop taking and needle avoiding movements through mechanism actuated from the lower shaft 95. This mechanism includes a crank |03 on the shaft 95 within the chamberv I4, whereof the pitman |08 connects at its lower end with 'a horizontal arm |05 on a rock shaft |08 which extends through a bearing in the portion 1 of .the cross partition of the base, and which is also journalled ina bearing |01 in the side wall 3. Secured tothe protruding end of the rock shaft |06 within the chamber I5 is an upright arm v|08 which, through a collapsible link |09, is connected to the carrier ||0 for the loopers |02. As shown in Fig. I, the looper carrier ||0 is mounted to swing on a stud III eX- tending laterally from a sleeve 'I I2 whichfis affixed to a rock shaft I|3 extending parallelato the rotary shaft Within the chamber |5.,"At y one end the shaft ||3 is journalled in a bearing I H5 in the end wall 5 of the base I, and at'rthe other end in a bearing ||6 in a lug ||1 projecting from" the partition 1. Through rockingof the shaft ||3 as just described. ,the loopers |02 are given their loop taking movements. Needle v avoiding movements are imparted to the loopers' |02 through a pendant arm H8 on the rock shaft ||3 connected to the strap |`|9 of an ec centric |20 amxed tothe lowerjshaft 95 within the chamber; I5. i

En route from suitable supply sources (not illustrated) the looper threads designated T formed with the machine base.

of the extended portion I of the chamber |52 From the lug- |21 the looper threads T pass di"- rectly to individual tensions |28 (Figs. I and' V) at the forward end of the portion 1 of the cross partition in the base I. Between the tensionsr |28 and the loopers |02 is a rotary take-up'of .well-known construction generally indicated by the numeral |29 in Figs. I, V,.VI and XI by which the looper threads T"are properly controlled. Attention is directed to the fact that the tube |23 is throughout'that portion of its length which is above the worksupport, and that its open side is at the right as' considered in Fig. VI.` AccordinglyA threading is made easy on the one hand, and on the other hand, the threads are protected from the work as the latter is fed across the top of the base I.

The feed mechanism of the machine is generally similar to that featured invU. S. Patent 2,048,874 granted to F. A. Kucera on July 28, 1936. As shown, it includes a feed dog |30 which is secured, with capacity for vertical adjustment, to a carrier in the form of a bar |3| which is yoked to extend over, as well as beneath, the shaft 95 as best seen in Fig. III, said bar being pivotally connected at its rear end by a pin |32 to the top of an upright rocker |33. As shown in Figs. III and V, the rocker |33 secured to a rock shaft |35, which, at one end, is journalled in'a bearing |36 in the end wall 5 and at the other end in a bearing |31 in a post |38 integrally From Fig. V, it will be 'further observed that the rock shaft |35 extends outward through the end wall and at a crank |4| on the protruding en d of ythe lower shaft 95. As aresult of these connections, it will be seenk that horizontal or feed movements are imparted to the feed dog |30. Referring to Fig. III, the underslung portion |42 Vof the feed dog carrier 3| has a pivotal connection at |43 with the strap arm |45 of an eccentric |46 on the lower shaft 95 within the chamber |5 whereby the necessary lift movements are induced in the feed dog |30.

In accordance with my invention, the hollow of the base is utilized as a sump for lubricating oil which is normally maintained at about the level indicated at L in Fig. I and into which dips the periphery of a disk |50 mounted on the lower shaft 95 directly adjacent the gear wheel 98,

which. it is to be noted is well above the lubri-- cant level. Through the rapid rotation of the disk |50 during the operation of the machine, oil is dispersed in the form of a mist within the hollow 'of the standard 3|. Part of this dispersed oil is deposited on the gears 96, 91, and S8, while some of it enters a port |5I on the machine frame to lubricate the right hand end bearing 52 for the upper shaft 49, and `some of it is deposited on the intermediate bearing 5| for f said shaft. Some of the dispersed oil is, moreover, trapped in an auxiliary reservoir |52 formed within said standard as an integral part of the machine frame. Extending `downward from the auxiliary reservoir |52 through a web |55 within the base is a duct |56 (Figs. I and IX)..which, at its lower end, connects with a channe1 groove |51 along the bottom of the rear wall 4 of said base. As shown in Fig.' VII, the channel 51 has lateral branches |58, |59 respectively atthe bottom of Vthe front wall 5'and at the bottom of the partition 1.

Extending upward from branch .|58 (Fig. X) in the end wall 5 are ducts |60, |6| and |62 which respectively deliver oil to the bearings 99, ||5 and |36 for the lowerk shaft 95, the looper shaft ||3' and the feed rock shaft |35. From the tops of the ducts |60, |6| and |62 in turn lead lateral wick tubes |63, |64 and |65 (F ig `X) which carry oil respectively to the feed lift crank |4| at the outer end of the lower shaft 95, to the left hand end pivot for the collapsible link |09, and to the upper pivot bearings on the feed rocker |33. Extending upward from the oil channel branch |59 (Fig. m) in the partition 1. is a duct |61 which carries oil to the intermediate bearing |00 for the lower shaft 95, while a lateral. bore |68 connecting with said branch conducts oil to the bearing ||6 for the looper shaft ||3. Another lateral bore |69 from the duct |61 leads forwardly through the horizontal partition toa vertical bore |10 in the front wall 3 of the base and a wick tube |1| extending from the top of said bore carries oil to the right hand end pivot of the collapsible link |09. From the top of the vertical duct |61 a lateral wick tube |12 carries oil to the eccentric |03 on the lower shaft 95 within the chamber I4. Another duct |13 (Figs. V and mV) leading vertically from the channel |51 in the post |38 carries oil to the bearing |31 for the feed rock shaft |35 and a Wick tube |15 extending laterally from the upper end of said duct conveys oil to the looper rocking eccentric on the lower shaft 95. The excess oil `released from the lubricated parts 'within' the chamber l5 is lteredof dirt or lint which may be carried along with it by a horizontal screen |16 extending crosswise of an opening |11 in the horizontal portion and removably secured to the bottom of said partition by screws |18. At the center, the filter screen |16 has a spherical upward bulge |19 which prevents filming of the oil and choking of said screen.

Referring once more to Fig. I, it will be Aap-l parent that some of the oil dispersed within the hollow of the standard 3| also finds its way into the bearing hub of the Iintermediate transmission gear wheel 91 which rotates freelyabout a transverse axle shaft |8| whereof the ends are secured in opposite side walls of said standard, and which is confined against axial shifting by thrust collars shown at |82 and |83. It is to be further noted that the right hand end bearing |0| for the lower shaft 95 is also automatically lubricated by the dispersed oil.

In order that the level vof the oil supply in the base may be checked from time to time, there is provided a depth gauge rod |85 (Figs. I and V) which passes down through an opening |86 in a boss |81 on the horizontal portion |0 of the partition within the base which forms the'bottom of the horizontal offset of the chamber I5. At the top, the gauge rod |85 has a grasp knob |88, while its lower end its flattened as at |89 and dips into the oil. Thus upon removal of the cover plate I1, the knob |88 is conveniently accessible for the purpose of withdrawing the gaugerod to check the level of the oil supply within the base. l

A guard plate |90 secured to a depressed flange extension |9| of the base at the left hand end thereof confines oil which may be dung v or dropped from the exterior parts |39 and Ml] ingly in order to obviate the necessity for repeti-A tive description, all the elements in the modification having their counterparts in said iirst embodiment are identified by the -same reference characters.

One difference to be noted in the modification is that the tensions ida for the looper threads are vertically arranged and'supported Aby the depressed horizontal portion i@ of the partition in the base.

Another departure from the first described embodiment is that in the modication, a supplernental feed or puller means is incorporated with the machine. As shown, this puller means includes a pair of superposed rollers i9@ and it@ which are located beyond the needles iii and the presser foot et as considered with respec't to the direction of feeding, see Figs. Km and m. The lower puller roller 2Q@ is mounted on a `shaft 382 Vwithin. the rear part of the base i which. extends directly over a depression iia in the feed dog carrier iti, said shaft being journalled in bearingbushings 263, 2li@ and 2u@ respectively set into the end wall 5, the partition li and the vertical web 55. Mounted on ings 225 and 226 receive oil by Way of ports 229 and 230 in the -tops of the bosses 221 and 228. The crank on the countershaft 2i!! is accessible for convenience of adjustment through an opening 23| in the front side wall 3 of the base I upon removal of a cover plate 232 which normally closes said opening.

From the foregoing, it will be apparent that I Y have provided an automatic circulating lubricatlli ing system whereby all the moving parts within the base, as well as within the hollow of the standard of the machine are constantly and effectively lubricated, the parts within the needle head being automatically lubricated as previously explained herein through splash action.

It will also be apparent that I have provided i'or the accommodation of all the parts except for those directly instrumental in thestitch formation, within thev machine frame, particularly the spring for the presser bar and the tensions respectively for the needle and looper threads, all

regard except for replenishing the oil in the base and in the needle head at protracted intervals.

Having thus described my invention, I claim: 1. A sewing machine comprising a frame with a hollow base having top and bottom walls, i ront the shaft db2, within the chamber i5, is ia.

clutch comprehensively designated 2M, which, through a pitman mit, is operated from an adjustable crank 22d@ on. a comitershaft 2i@ also within-said chamber at the front of the latter.

As shown in Figs. m and m11, the counterin the wall 2 of the base, and said'- upper feed roller is journalled in a yoke Elli at the bottom of an auxiliary presser bar ibvwhich is guided for up and down movement ina bracket 2id secured by screws dil to the rear side of the needle 33. Within the hollow of the bracket 2id is a helical spring 2id which, at its lower end bears upon a collar 2i@ on the auxiliary presser bar 2te, tht-pressure of the spring being regulatable by an adjustable screw sleeve 22d against which its upper end of the spring abuts as clearly shownin Fig. XXIV, said sleeve serving as the top guide bearing for the auxiliary bar. The bearings 2% and dfi'are lubricated with oil conducted to them respectivelyfrom the cil channel branches ld and` 655i at the bottoms of the end base wall 5,]and the partition m1). The bearing 2&5 for the shaft 2M is supplied with oli from the main distributing channel ll at the bottom of the rear base wall 'via the vertical duct tt in the web 206. The

Figs. m and mi, the countershaft 2l@ is journalled in bearing sleeves 225? 4and 22d respectively set into integral bosses 22? and 22a on the base i within the chamber it. -The bearl by way of vertical ducts lgand 222 (Fig.

and rear side walls, end walls, and a cross partition subdividing the base into two adjacent chambers of which the one contains a supply of lubricating oil and is completely enclosed, and the other is partly open for access from the exterior; drive mechanism within the rst chamber including moving means for taking oil from the supply in the base and dispersing it to automatically lubricate said mechanism; looper mechanism within the second chamber; feed mechanism with some of its parts within the second chamber and some of them externally thereof; means for trapping part of the oil dispersed in the first chamber at a level above the looper and feed mechanisms for conduction by gravity through ducts in the walls of'the base to the various. moving parts of said looper and feed mechanisms.

2. A sewing machine according to claim' l, in which the top and bottom walls ofthe base are extended over and beneath the parts of the feeding mechanism exterior to the second chamber, and in which a supplemental 4wall encloses said parts.

3. .A sewing machine according to claim l, in which'the portion 'of the rear wall of thebase constituting the back of the second chamber is :in the form of a removable plate.

4. A sewing machine comprising a frame with a hollow base having top and bottom walls, front and rear side walls. end walls, and a cross partition subdividing the base into two adjacent chambers of which the one contains a supply of lubricating oil and is completely enclosed, and the yother is partially open for convenience of access ing channel at the bottom of one of the side walls of the base receiving oil from the auxiliary reservoir, said channel having transverse branches in the bottom of the outer end wall of the-second'chamber and in the bottom of the with two adjacent isolated chambers, one of said chambers containing a supply of lubricating oil and having a portion underlying the other chamber; drive 'mechanism within the first chamber including means for taking oil from the supply and dispersingv it to automatically lubricate said mechanism; looper and feed mechanisms in the second chamber; means for trapping Ysome of the oil dispersed in the first chamber and for ccnducting it through the walls of the-base to the various moving parts of the looper and feed mechanisms in the second chamber; and a screen extending crosswise of an opening in the bottom of the second chamber to filter excess oil which drips from the feed and looper mechanism before such oil is returned to the supplyV in the first chamber, said screen having an upward bulge to prevent filming of the oil thereover.

6. A sewing machine comprising a frame with a hollow base having top and bottom walls, front and rear side walls, end walls, and a cross partition subdividing it into two adjacent chambers of which the rst contains a supply of lubricating and engages into the bottom of the aforesaid offset of the second chamber, the bolt head having oil,- said partition having a horizontal portionv which forms the bottom of the second chamber with provision of a narrow interspace between it and the bottom wall of the base; drive mechanism Within4 the first chamber with means for taking oil from the supply and dispersing it for the automatic lubrication of said mechanisms;

feed and looper mechanisms within the second chamber; means within the first chamber for trapping some of the oil dispersedas aforesaid and for conducting it through the walls of thebase to the moving parts of the feed and looper mechanisms within the second chamber; and a screen extending crosswise of an opening in a bottom of the second chamber to filter excess oil which drips from the feed and looper mechanisms before such oil is returned to the supply in the first chamber, said screen having an upward bulgeto prevent filming of the oil thereover.

7.- A sewing machine comprising a hollow base with two adjacent isolated chambers, one of said chambers containing a supply of lubricating oil, and the other chamber having a horizontal offset which partial1y overlies the first chamber; l driving mechanism Yin the firstchamber including means for taking oil from the supply and dispersing it to automatically lubricate said mechanism; looper mechanism within the second chamber; looper thread tensions in the horizontal offset of the second chamber; a cover plate closing an access opening in the top of thebase into the horizontal offset of the second chamber; and quick releasable securing means for the cover including an elongate aperture' in said cover, and a bolt with an elongate head corresponding in size with the aperture in the cover and a screw shank which passes down through-the aperture at the bottom of its opposite ends camming surfaces to override the side edges of the aperture in the cover and clamp it down as the bolt is rotated through a quarter turn.

8. A sewing machine comprising a frame with a hollow base having top and bottom walls, front 4and rear side walls, and a cross partition subdividing the base into two adjacent chambers of which one contains a supply of lubricant oil, said partition defining in the second chamber a horizontal offset which partly overlies the first chamber and accommodates looper thread tensions; drive mechanism in the first chamber including means for taking oil from the supply and dispersing it to automatically lubricate said mechanism; looper and feed mechanisms in the second chamber; means for trapping part of theoil dispersed in the first chamber and for conducting it through thewalls of the base to the moving parts of the looper and feed mechanisms in the second chamber; a depth gauge rod extending with a tightfit down through an aperture 'in the bottom -of the horizontal offset of the second chamber with its lower end dipping' into the oil supply in the first chamber, and with its upper end accessible in said offset for convenience of withdrawing the rod; and a retractable top cover for the horizontal offset of said second chamber. l

9. A sewing machine comprising a, frame with a hollow base having top and bottom walls, front and rear side walls, and a cross partition subdividing the base 'into two adjacent chambers of which one contains a supply of lubricant oil, said partition definingin the second chamber a horiv zontal offset which partly overlies the first chamchamber; means for trapping part of thevoil dispersed in the first chamber and for conducting it through the walls of the base to the moving parts of the looperand feed mechanisms in the second chamber; a retractable cover for a top opening into the offset portion of the second chamber; means for conducting the looper threads to the tensions including an upstanding tube on the baseadapted to be traversed by the threads and having guide eyes adjacent the top and bottom thereof; and a groove in the upper surface of the ltop wall' of the base by way of which the vthreads pass from the guide eyes at the bottom of the tube beneath the cover aforesaid into the offset portions of the second chamber en route to the tensions.

- 10. A sewing machine according to claim 9, in which the' lower end of the tube is anchored in the machine base and in which the portion of said tube above the base is split for convenience of initially passing the threads through its guide eyes.

11. A sewing' machine according to claim 9, in which the cover fits within a marginal recess around the opening, and in which the groove extends down into said marginal depression to a level below the cover.

is located, out of the way, to the rear of the standard.

13. A sewing machine comprising a frame with a horizontal work support, an overhanging arm, and a closed hollow head at the free end of the arm; a well for lubricant at the bottom of the 14. A sewing machine comprising a'frame with a horizontal work support, an overhanging arm, and a closed hollow head at the free end of the arm; a, well for lubricant at the bottom of the head; an endwise reciprocating needle bar; a

guide bushing through which the needle bar extends upward into the head, the topof said bushing being above the level of the lubricant in the well; needle operating mechanism within the head including a member which takes lubricant from the well and disperses it to lubricate said mechanism; an endwise shiftable presser bar; another guide bushing like that for the vneedle bar through which the presser bar extends upward into the head; and vertically arranged vshield means to prevent direct splash of lubricant from said mechanism onto the aforesaid guide bushings.

' l5. A sewing machine according to claim 13, in which the overhanging arm is hollow and has a transverse portion therein to form the back of the needle head; and including a horizontal leaf spring for the presser bar having its anchorage with the arm and extending through the parti-` between the( standard and the head; -needle operating mechanism within the head lubricated by oil dispersed from the supply inthe latter; drive mechanism within the hollow ofthe standard lubricated by oil dispersed fromthe supply in the base; a needle actuating shaft within the arm extending horizontally from the drive mechanism within the standard through bearings in the partitions to the needle operating mechanismA in the head; a presser foot-attached to a presser bar which extendsupward into the head; a leaf spring anchored within the central chamber 'of the arm and extending through a clearance opening in one of the lpartitions into the head to engage the presser bar; and shieldmeans to prevent dispersed oil from passing from the head into the central chamber of the arm.

19. A sewing machine according to claim 18,

including a rock shaft within the central chamber ofthe arm journalled Within the central chamber of the arm and extending at one end through a bearing in one of the partitions into the needle head; means on the rock shaft within the needle head for lifting the presser bar; and an actuating lever secured to the rock shaft within said central chamber of the arm and ex tending through -a clearance opening in the side of the overhanging arm.

20. A sewing machine according to claim 18, including needle thread tensions within the cen-v tral chamber of the arm; a rock shaft journalled within the central chamber of the arm and extending at one end through a bearing in one of the partitions into the needle head; means on the rock shaft within the needle head for lifting the presser bar; means on the rock shaft within the central chamber of the arm for controlling the thre'ad tensions; and an actuating tion into the,hol1ow of the head, said opening being also guarded against splash of lubricant through itvby the shield means.

16. A sewing machine according to claim 13, in which the overhanging arm is hollow and vhas a transverse portion therein to form the back of the needle head; and including a horizontal leaf spring for the presser bar having its anchorage with the arm and extending through the parti-- tion into the hollow of the head, and a separate shield also Within the head to prevent lubricant from splashing through the opening in the partition aforesaid into the hollow of the arm.

i7. A sewing machine comprising a frame with a base, a standard rising from the base and supporting a hollow overhanging arm with a hollow head at its free end, and a cross partition forming the back of the head and separating the hollow of the latter from the hollow of the arm; needle operating mechanism within the arm; a presser foot attached to a presser bar which extends upward into the head; and a horizontal leaf spring with one end anchored within the hollow of the arm and with its othen end extending through a clearance opening in the partition into the hollow of the arm to engage the presser bar.

18. A sewing machine comprising a frame with a .hollow base containing lubricant, a hollow communicating -standard rising from the base and supporting a hollow overhanging arm with a hollow head at its free end also containing a supply of lubricating oil, and cross partitions fsetting apart a central'chamber within the arm lever secured to the rock shaft within` said central chamber and extending 'to the exterior through a clearance opening in the side of the overhanging arm.

21. A sewing machine comprising a closed hollow base which at its bottom contains a supply of lubricating oil; actuating devices for stitch forming and feeding mechanisms within lthe base; means for taking oil from the supply in the base and dispersing it upwardly within the base to lubricate the stitch forming and feeding mechanisms; a pair-of opposing puller feed rollers; and mechanism also enclosed within the base for lubrication by the dispersed oil, to actuate the puller rollers.

22. A sewing machine comprising a closed hollow base which contains a supply of lubricating oil; actuating devices for switch forming means and feeding mechanisms within the base; means for taking oil from the supply inthe base and dispersing it upwardlywithin the base; puller feed means including a pair of opposing rollers; and actuating means for the rollers including a shaft which extends into the hollow of the base and carries one of the rollers, and mechanism for rotating said shaft also enclosed within the base for lubrication by the dispersed oil,

23. A sewing machine comprising a closed hollow base which contains a supply of lubricating "011; stitch forming and feeding mechanisms within the base; a rotary shaft from which said mechanisms derive their motion, journalled within the base; a pair of opposing puller feed rollers; a clutch within `the base and connections between it and the rotary shaft for intermittently rotating one of the puller rollers; and means for taking oil from the supply and dispersing it within the base to automatically lubricate the shaft bearings, the stitch forming and feeding mechanisms and the clutch and its connections.

24'. A sewing machine comprising a closed hollow base which contains a supply of lubricating oil; stitch forming and feeding mechanisms Within the base; a rotary shaft from which said mechanisms derive their motion, journalled within the base; a pair of opposing puller feed rollers; a shaft for one of the puller rollers journalled within the base; a clutch mounted on said roller shaft; means on the' rotary shaft for actuating the clutch to intermittently rotate vthe roller shaft; and means for taking oil from the supply and dispersing it within the base to automatically lubricate the stitch Aforming and feeding mechanisms, and the enclosed parts of the puller mechanism.

25. A sewing machine comprising a closed hollow base .which contains a supply of lubricating oil; stitch forming and feeding mechanisms within the base; a rotary shaft, from which said mechanisms derive their motion, journalled within the base; a pair of opposing puller feed rollers; a shaft for one of the puller rollers journalled within the base; a clutch mounted on said roller shaft; a countershaft also journalled within the base; `gear connections between the rotary shaft and, the countershaft within the base; connections between the countershaft and the clutch for intermittently rotating the roller shaft; and means for taking oil from the supply and dispersing it within the base to automatically lubricate the parts of the stitch forming and feeding mechanisms and the enclosed parts of the puller mechanism. f

GEORGE SAUER. 

